Give features of long form of periodic table
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The main features of modern periodic table
Elements are arranged in the increasing order of atomic numbers.
Elements in the modern periodic table are arranged in 7 periods and 18 groups.
Horizontal rows are called periods and vertical columns are called groups.
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Main Features of the Long Form of the Periodic Table :
(1) It shows arrangement of elements based on modern periodic law.
(2) There are 18 vertical columns known as groups.
(3) There are 7 horizontal rows known as periods.
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